Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income and (Loss), Before Tax	$ 8,944		$ 6,537
Deferred Tax Liabilities, Other Comprehensive Income			(2,526)
Change in net unrealized gain on investments	2,529	2,327
Reclassification adjustment for net realized investment (gains) losses	(122)	(14)
Accumulated Other Comprehensive Income (Loss), Tax (Expense) Benefit	3,456
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(977)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	47
Accumulated other comprehensive income	5,488		4,011
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	1,552
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (75)